Mailer Visualizer

[Major, Michael T]

This should be an easy one, but I just can't find any documentation on
it.
 
Can anyone tell me how to list multiple emails within the mailer
visualizer?  Is it comma delimited, etc.?
 
I have no problem with just one email account, but everytime I try to
run it against multiple email addresses, the test email fails and gives
me a "The mail-server is unknown" error.
 
Thank you,
 
Mike